Tire characteristic value measurement apparatus and tire characteristic value measurement system

1. A tire characteristic value measurement apparatus comprising:

conveyance means for conveying a tire;

vertical movement means which is disposed below the conveyance means and is able to vertically move;

a bearing member which is provided in the vertical movement means and bears the tire on the conveyance means from below in accordance with a rise, and in which at least a contact surface to be brought into contact with the tire has electrically insulative properties; and

electric resistance value detection means which is provided in the vertical movement means and detects an electric resistance value of the tire borne by the bearing member.

2. The tire characteristic value measurement apparatus according to claim 1 , further comprising:

weight detection means which is provided in the vertical movement means and detects a weight of the tire borne by the bearing member.

3. The tire characteristic value measurement apparatus according to claim 2 ,

wherein the vertical movement means includes

a fluid pressure cylinder which is installed such that an axial direction is oriented toward an upward/downward direction,

an offset support member of which a base end portion is coupled to an upper end of the fluid pressure cylinder and of which a tip end portion is positioned at a position offset to the side lower than the upper end of the fluid pressure cylinder when the fluid pressure cylinder contracts, and

guide means which is coupled to the offset support member and guides a vertical movement of the offset support member,

wherein the weight detection means and the electric resistance value detection means are supported by the tip end portion of the offset support member of the vertical movement means, and

wherein the bearing member is provided in the weight detection means.

4. The tire characteristic value measurement apparatus according to claim 3 ,

wherein the guide means of the vertical movement means includes

a pair of guide rails of which a longitudinal direction is oriented toward the upward/downward direction, and

sliders which are respectively provided in the guide rails so as to be able to slide along the longitudinal direction of the guide rails and are individually coupled to the offset support member.

5. The tire characteristic value measurement apparatus according to claim 3 ,

wherein the electric resistance value detection means includes

probes which make a pair, and

probe holding means which is supported by the tip end portion of the offset support member of the vertical movement means and holds the probes making a pair such that the probes are able to move in a direction of approaching and being separated from each other.

6. The tire characteristic value measurement apparatus according to claim 2 , further comprising:

a weight measurement station which has a weight/electric resistance measurement portion having the electric resistance value detection means and the weight detection means, and a tire marking portion being able to perform marking on the tire, and in which the tire marking portion is disposed above the weight/electric resistance measurement portion.

7. The tire characteristic value measurement apparatus according to claim 6 ,

wherein the weight measurement station includes a center position adjustment mechanism which adjusts a center position of the tire, and

wherein the center position adjustment mechanism includes a rotary position adjustment roller which abuts a part of the tire and is rotated so as to rotate the tire around an axis line of the tire.

8. A tire characteristic value measurement system comprising:

the tire characteristic value measurement apparatus according to claim 6 ;

a uniformity machine which is disposed on an upstream side of the weight measurement station in a conveyance direction of the tire and measures uniformity of the tire; and

a dynamic balancing machine which is disposed on an upstream side of the weight measurement station in the conveyance direction of the tire and measures an amount of imbalance in the tire,

wherein the tire marking portion individually marks a measurement result of the uniformity machine and a measurement result of the dynamic balancing machine on the tire.